Optical measurements of orientational order in uniaxial and biaxial nematic liquid crystals

Gleeson, H. F. and Southern, C. D. and Brimicombe, P. D. and Goodby, J. W. and Gortz, V. (2010) Optical measurements of orientational order in uniaxial and biaxial nematic liquid crystals. Liquid Crystals, 37 (6-7). pp. 949-959. ISSN 0267-8292

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Abstract

The use of optical methods to study the orientational order in nematic liquid crystals is both convenient and powerful. Some of the earliest approaches made use of measurements of the refractive index anisotropy, following the methodology of Halle [1] to measure the order parameter, [image omitted]. This method is reviewed briefly and some typical areas of application are presented. Raman spectroscopy is a second approach discussed in this paper. Although technically a more complex methodology, Raman spectroscopy has the significant advantage that in addition to being able to measure [image omitted] it is also possible to determine [image omitted]. A review of current approaches is presented. Very recently, it has been shown that polarised Raman spectroscopy can be employed to determine biaxial order parameters in liquid crystals. The methodology is described, and data are presented for such measurements on a series of bent-core nematic materials that could exhibit the elusive biaxial nematic phase.

Item Type:
Journal Article
Journal or Publication Title:
Liquid Crystals
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3104
Subjects:
ID Code:
65900
Deposited By:
Deposited On:
07 Aug 2013 10:30
Refereed?:
Yes
Published?:
Published
Last Modified:
13 May 2020 02:13